if you don't actually have a jersey to measure the letters, I would first measure the height of of the strips and then the number and letters, then, knowing the height of the stripes you can then determine how many of them would fit into the number, for instance if the strip is one and a half inches high, and you you could put six of them to be the same height as the number, tthen you would know that the number must be 9 inches high, same with the width of the numbers and the name. HTH